在
中,
,点D、E分别在
、
上,将线段
绕点E逆时针旋转
得到线段
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/23/c7274efb-f914-446d-b535-a242254077f3.png?resizew=629)
(1)如图1,若
,点D为
中点,
,连接
交
于点G.
①将图1补充完整;
②填空:
__________;
(2)如图2,求证:
;
(3)如图3,直接写出线段
之间的关系式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bcf1415fb6be150ae8c87f6882dd1b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/23/c7274efb-f914-446d-b535-a242254077f3.png?resizew=629)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd657e48b15b9b54a55817e2c26b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
①将图1补充完整;
②填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/478d8cdad9506e889570ca6618a49615.png)
(2)如图2,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fae89e7b78fd35f0f91769896b618dd.png)
(3)如图3,直接写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d949ccc0309234aeccba5f900ebe293d.png)
更新时间:2023-03-19 17:31:52
|
相似题推荐
解答题-证明题
|
较难
(0.4)
名校
【推荐1】如图1,在
和
中,
,
,且
,则可证明得到
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/95173b6b-195a-4be6-866e-5d123c95312e.png?resizew=179)
(1)【初步探究】如图2,
为等边三角形,过
点作
的垂线
,点
为
上一动点(不与点
重合),连接
,把线段
绕点
逆时针方向旋转60°得到
,连
.请写出
与
的数量关系并说明理由;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/bff4d1b1-dbd3-401d-844c-fad2e51f7a35.png?resizew=140)
(2)【深入探究】如图3,在(1)的条件下,连接
并延长
交直线
于点
.当点
运动到
时,若
,求
的长;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/f03ce1be-ab4b-42b3-8281-d479208d72e1.png?resizew=120)
(3)【拓展探究】如图4,在
中,
,以
为直角边,
为直角顶点向外作等腰直角
,连接
,若
,
,则
长为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a783e5ffcf7a4ea9e531ea76199487.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5fc6ead6416492c231c320a5486f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc13fe21e64d9b45614ed43be847904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02fbbe04651b37e1520bb9a7bafed509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb9e2b2332403444a51a71c0c575f1d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/95173b6b-195a-4be6-866e-5d123c95312e.png?resizew=179)
(1)【初步探究】如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf702adb116c1e46569eb7050d029f49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/bff4d1b1-dbd3-401d-844c-fad2e51f7a35.png?resizew=140)
(2)【深入探究】如图3,在(1)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/289d7a880379d6060065c829b45b0ed6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3088fd880647adc6d7ed0cc72bc7e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71807a35b3170fce28ee6edf4c00d083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/f03ce1be-ab4b-42b3-8281-d479208d72e1.png?resizew=120)
(3)【拓展探究】如图4,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27e47690ed332c573186992b6d25654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/c79f5993-9ca3-4898-9fbd-c3aee920ccec.png?resizew=139)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】如图,
是等边三角形,将线段
绕点A逆时针旋转至
(
不与
重合),旋转角记为
,
的平分线
与射线
相交于点E,连接
.
(1)如图1,当
时,
的度数是________________;
(2)如图2,当
时,求证:
;
(3)当
,
,
时,请直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721c75fcd58d3d54260aad0f82e09e37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/25/bffa6e84-38e4-4d1c-86b4-41cfba540c7c.png?resizew=464)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c96cb3ac8290e09c55d4eb336a8608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c5d3f1c7f7ffdf572978468d5a3adde.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50515b0461f55861fd28f2774a2f01dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32842a894994b85184a6d0b4191a3757.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e915c7310f3781887a1afb99dbf949.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/062dce8064e53a0b82a3f9f9030ccb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐1】如图,
中,
,现有两点
、
分别从点
、点
同时出发,沿三角形的边顺时针运动,点
的速度为
,点
的速度为
,当点
第一次到达
点时,
,
同时停止运动.
(1)点
,
运动几秒后,
,
两点重合?
(2)点
,
运动时,是否存在以
为底边的等腰三角形
?如存在,请求出此时
,
运动的时间.若不存在,请说明理由.
(3)点
,
运动几秒后,可得到直角三角形
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1369c6f1b9683278afe8c3f4148a9495.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5631e6ec24d3d67bf4592313b6b3f4f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d989a128e30a701dfff5592476a76bab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/11/db3c16f1-bf6b-4456-8708-3cee56a381c2.png?resizew=148)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1885efcff0b903e314057dd153578600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad50b21465d85a77f48acf4ca7e6c951.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】菱形
中,
,
,
为
上一个动点,
,连接
并延长交
延长线于点
.
(1)如图1,求证:
;
(2)当
为直角三角形时,求
的长;
(3)当
为
的中点,求
的最小值.
![](https://img.xkw.com/dksih/QBM/2020/2/6/2393378432483328/2394449747402752/STEM/4b58a760ee564ed487fb7f16133cda35.png?resizew=206)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37680e31ec8ed9abb20b469eee89e463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/197afe2823d441bd68ed89a9d393fb29.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6249eb8788e4d72ff1d436d21b46f04f.png)
![](https://img.xkw.com/dksih/QBM/2020/2/6/2393378432483328/2394449747402752/STEM/4b58a760ee564ed487fb7f16133cda35.png?resizew=206)
![](https://img.xkw.com/dksih/QBM/2020/2/6/2393378432483328/2394449747402752/STEM/be1d74c6bc1b4b55ab97edc8352d9035.png?resizew=161)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐3】如图1,△ABC中,∠ABC=90°,AB=1,BC=2,将线段BC绕点C顺时旋转90°得到线段CD,连接AD.
![](https://img.xkw.com/dksih/QBM/2019/7/6/2240838394576896/2241043439247360/STEM/730d675071c44085a004715cd2779623.png?resizew=605)
(1)说明△ACD的形状,并求出△ACD的面积;
(2)把等腰直角三角板按如图2的方式摆放,顶点E在CB边上,顶点F在DC的延长线上,直角顶点与点C重合.从A,B两题中任选一题作答:
A .如图3,连接DE,BF,
①猜想并证明DE与BF之间的关系;②将三角板绕点C逆时针旋转α(0°<α<90°),直接写出DE与BF之间的关系.
B .将图2中的三角板绕点C逆时针旋转α(0<α<360°),如图4所示,连接BE,DF,连接点C与BE的中点M,
①猜想并证明CM与DF之间的关系;②当CE=1,CM=
时,请直接写出α的值.
![](https://img.xkw.com/dksih/QBM/2019/7/6/2240838394576896/2241043439247360/STEM/730d675071c44085a004715cd2779623.png?resizew=605)
(1)说明△ACD的形状,并求出△ACD的面积;
(2)把等腰直角三角板按如图2的方式摆放,顶点E在CB边上,顶点F在DC的延长线上,直角顶点与点C重合.从A,B两题中任选一题作答:
A .如图3,连接DE,BF,
①猜想并证明DE与BF之间的关系;②将三角板绕点C逆时针旋转α(0°<α<90°),直接写出DE与BF之间的关系.
B .将图2中的三角板绕点C逆时针旋转α(0<α<360°),如图4所示,连接BE,DF,连接点C与BE的中点M,
①猜想并证明CM与DF之间的关系;②当CE=1,CM=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047616f1d1d39bf6c3cd07cf63ef5b80.png)
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【推荐1】【问题背景】如图1,在
中,
,点E在
上,
,
.四边形
是正方形,求图中阴影部分的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/60ee5f73-900f-4bea-b1cd-3735afdfb650.png?resizew=520)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/50c0ba35-d115-461c-97cf-53670885e0d3.png?resizew=284)
(1)【问题发现】如图2,小芳发现,只要将
绕点E逆时针旋转一定的角度到达
,就能将阴影部分转化到一个三角形里,从而轻松解答.根据小芳的发现,可求出图1中阴影部分的面积为 ;(直接写出答案)
(2)【类比探究】如图3,在四边形
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/992a5ce4cf21507ff36fe30ff6f678ba.png)
于点E,若
的长为6,试求出四边形
的面积.
(3)如图4,在正方形
中,点E,F分别在正方形
的边
上,
,连接
,猜想
之间满足的数量关系,并说明理由.
(4)【拓展应用】如图5,在矩形
中,
,点E、F分别在边
上,
,连接
,则
的长为 (直接写出答案).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5d30cd3e53a9df24fe6da5e8a3a7ec5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/620fd368efb51a5ae90c0f3e276704d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/60ee5f73-900f-4bea-b1cd-3735afdfb650.png?resizew=520)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/50c0ba35-d115-461c-97cf-53670885e0d3.png?resizew=284)
(1)【问题发现】如图2,小芳发现,只要将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/819c7b5b9b9010edefd06be8a0e7296c.png)
(2)【类比探究】如图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/992a5ce4cf21507ff36fe30ff6f678ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)如图4,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8dbf16d3adcc74fbea454665bc66ca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/720da9a99954c5516beb3422e94a22b0.png)
(4)【拓展应用】如图5,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e20a58b0f3828850a767de4a906c79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8dbf16d3adcc74fbea454665bc66ca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/337cde5043acf3844d6e003267c03f3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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【推荐2】如图将边长为4的正方形纸片ABCD折叠,使B点落在CD边上一点E,压平后得到折痕MN,当
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/eb325231-1905-4452-a068-8dfb92560f92.png?resizew=134)
(1)求NE的长;
(2)连AN、AE,NG⊥AE,垂足为G,求GN的长;
(3)直接写出AM的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2913b96dbeb7fa907bc39d09d2ed7de1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/eb325231-1905-4452-a068-8dfb92560f92.png?resizew=134)
(1)求NE的长;
(2)连AN、AE,NG⊥AE,垂足为G,求GN的长;
(3)直接写出AM的长度.
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解题方法
【推荐1】如图,已知抛物线y=ax2+bx+c(a≠0)与x轴交于点A、B,与y轴分别交于点C,其中点A(﹣1,0),OB=4OA,OC=2OA
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/7/a9227adb-05a6-4149-ac6a-efe1d4955906.png?resizew=134)
(1)求抛物线的解析式.
(2)点P是线段AB一动点,过P作PD∥AC交BC于D,当△PCD面积最大时,求点P的坐标.
(3)点M是位于线段BC上方的抛物线上一点,当∠ABC恰好等于△BCM中的某个角时,直接写出点M的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/7/a9227adb-05a6-4149-ac6a-efe1d4955906.png?resizew=134)
(1)求抛物线的解析式.
(2)点P是线段AB一动点,过P作PD∥AC交BC于D,当△PCD面积最大时,求点P的坐标.
(3)点M是位于线段BC上方的抛物线上一点,当∠ABC恰好等于△BCM中的某个角时,直接写出点M的坐标.
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解答题-证明题
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【推荐2】(1)背景问题:如图①,已知矩形ABCD,E是边CD上一点,将△BCE沿BE翻折,使得C落在AD上的点F处,求证:△ABF∽△DFE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/8a6a7e4a-64b5-4a69-ae93-c663e275fedc.png?resizew=393)
(1)尝试应用:如图②,已知四边形ABCD中,∠A=∠D=90°,点E在AD上,∠BEC=90°,2∠BCE+∠ECD=180°,过点E作EF⊥BC垂足为F,若EF=2,BC=5,求AE的长.
(2)拓展创新:如图③,已知矩形ABCD,AB=9,BC=12,E是边CD上一动点,将△BCE沿BE翻折至△BPE,连接AP在上取点T,使得PT=2AT,连接DT,求出DT 长度的最小值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/8a6a7e4a-64b5-4a69-ae93-c663e275fedc.png?resizew=393)
(1)尝试应用:如图②,已知四边形ABCD中,∠A=∠D=90°,点E在AD上,∠BEC=90°,2∠BCE+∠ECD=180°,过点E作EF⊥BC垂足为F,若EF=2,BC=5,求AE的长.
(2)拓展创新:如图③,已知矩形ABCD,AB=9,BC=12,E是边CD上一动点,将△BCE沿BE翻折至△BPE,连接AP在上取点T,使得PT=2AT,连接DT,求出DT 长度的最小值.
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